Method and facility for producing material containing hydrated cement

Patent metadata

Field	Value
Publication number	US-12005459-B2
Application number	US-201917276881-A
Country	US
Kind code	B2
Filing date	Sep 17, 2019
Priority date	Sep 20, 2018
Publication date	Jun 11, 2024
Grant date	Jun 11, 2024

Abstract

A method for processing material that contains cement rock may involve comminuting the material in a first comminuting device, feeding the material to a reactor in which the material is mixed with an aqueous liquid and CO 2 and in which a mixing movement of the material is generated, and removing the material from the reactor and subdividing the material into at least two fractions by way of a classifying device. The temperature and the pressure in the reactor are maintained such that the pressure exceeds atmospheric pressure and such that the temperature is greater than 100° C. The method may further involve removing a withdrawal stream of the aqueous liquid from the reactor and separating and discharging suspended particles of the material from the withdrawal stream.

First claim

What is claimed is:

1. A method for processing material that contains cement rock, the method comprising:
comminuting the material in a first comminuting device;
feeding the material to a reactor in which the material is mixed with an aqueous liquid and CO 2 , wherein a mixing movement of the material is generated in the reactor;
maintaining a temperature in the reactor at greater than 100° C. and maintaining a pressure in the reactor to be greater than an atmospheric pressure; and
removing the material from the reactor and subdividing the material into at least two fractions via a classifying device, wherein the at least two fractions include at least a coarse fraction and middle fraction and wherein the coarse fraction is larger than 16 mm and the middle fraction is smaller than 16 mm, further comprising returning the coarse fraction of the at least two fractions to the reactor and comminuting the coarse fraction in a second comminuting device before returning the coarse fraction to the reactor.

2. The method of claim 1 comprising:
removing a withdrawal stream of the aqueous liquid from the reactor; and
separating and discharging suspended particles of the material from the withdrawal stream.

3. The method of claim 2 comprising returning the withdrawal stream to the reactor as a recirculation stream after the separation of the suspended particles.

4. The method of claim 1 comprising:
subdividing the material removed from the reactor into at least three fractions via the classifying device, including a fine fraction, a middle fraction, and a coarse fraction; and
discharging the fine fraction and the middle fraction.

5. The method of claim 4 wherein the middle fraction has a grain size of between 2 mm and 16 mm.

6. The method of claim 1 comprising analyzing a smaller fraction of the at least two fractions in terms of cement rock content.

7. The method of claim 6 comprising returning the smaller fraction to the reactor where the cement rock content is determined to be greater than a limit value.

8. The method of claim 1 comprising introducing a basic additive into the reactor.

9. The method of claim 1 wherein the aqueous liquid and the CO 2 flow through the material in the reactor in a counterflow arrangement.

10. The method of claim 1 comprising separating the at least two fractions from a discharge stream of the aqueous liquid that was removed from the reactor together with the material.

11. The method of claim 10 comprising at least partially returning the discharge stream of the aqueous liquid freed from the at least two fractions to at least one of the classifying device or the reactor.

12. The method of claim 1 comprising removing a gas stream of CO 2 from the reactor and recirculating the removed gas stream of CO 2 to the reactor.

13. The method of claim 1 comprising removing non-mineral constituents from the material before the material is introduced into the reactor.

14. A plant for processing material that contains cement rock, the plant comprising:
a first comminuting device for comminuting the material;
a reactor that is connected to the first comminuting device in a material-carrying manner, the reactor comprising a mixing device;
a fluid supply for an aqueous liquid that is connected to the reactor in a fluid-conducting manner;
a gas supply for CO 2 that is connected to the reactor in a fluid-conducting manner;
a classifying device connected to the reactor in a material-carrying manner, the classifying device configured to subdivide the material into at least two fractions;
a temperature regulating device for influencing a temperature in the reactor;
a pressure regulating device for influencing a pressure in the reactor; and
a material return line for returning at least one of the at least two fractions from the classifying device to the reactor; and
a second comminuting device integrated into the material return line.

15. The plant of claim 14 comprising:
a material inlet, a liquid outlet, and a gas outlet disposed at a first end of the reactor; and
a material outlet, a liquid inlet, and a gas inlet disposed at a second end of the reactor.

16. The plant of claim 14 comprising a separating device for separating suspended particles from a withdrawal stream of the aqueous liquid that has been discharged from the reactor.

17. The plant of claim 14 comprising at least one of:
an analyzing device for analyzing a cement rock content in at least one of the at least two fractions;
an introducing device for introducing a basic additive into the reactor;
the reactor configured as a vertical reactor;
a gas return line for returning CO 2 from a gas outlet to a gas inlet of the reactor; or
a removing device for removing non-mineral constituents of the material before the material is introduced into the reactor.

Assignees

• Thyssenkrupp Ind Solutions Ag
• Thyssenkrupp Ag

Inventors

• Willms Eike
• Kache Guido
• Lemke Jost

Classifications

• B02C23/38

  in apparatus having multiple crushing or disintegrating zones · CPC title

• B02C23/24

  Passing gas through crushing or disintegrating zone ({B02C15/001}, B02C23/38, B02C23/40 take precedence) · CPC title

• B02C23/18

  Adding fluid, other than for crushing or disintegrating by fluid energy ({for tumbling mills B02C17/186;} feeding devices B02C23/02) · CPC title

• B02C23/10

  with separator arranged in discharge path of crushing or disintegrating zone · CPC title

• C04B18/167

  Recycled materials, i.e. waste materials reused in the production of the same materials · CPC title